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The details of an experimental active radar absorber have been presented. The absorber is based on the topology of a Salisbury screen but uses an active impedance layer to provide reflectivity tuning. The active impedance layer is a FSS controlled by semiconductor pin diodes. Measured reflectivity characteristics have been presented and compared to predictions obtained from a simple equivalent circuit transmission line model. The structure has also been analysed using the Ansoft HFSS electromagnetic simulator software in which the diode has been modelled by a small planar slab of material with variable surface impedance. This model provides superior result to the transmission line model in predicting the resonance frequencies of the FSS.
Antennas and Propagation Society International Symposium, 2003. IEEE (Volume:4 )
Date of Conference: 22-27 June 2003